Abstract
The objectives of this study is to investigate the effect of the 3 apex angles of cone and ground water tables on the bearing capacity of sandy soil layer by using light weight penetration test. Silty sandy soil (SM) was provided as the representative of sandy soils for some area in Thailand. The SM soil layer was prepared in the testing tank and also set three depths of ground water table for testing . According to results, the cone angle increase, a number of blows increase and the adjusted factors of the blows from the apex angles of 60º and 180 º to be that of the apex angle of 90º (control) were 1.118 and 0.878, respectively. The obtained correlation between the blows and the internal friction angles of SM soil can be used for calculating the soil bearing capacity which lowers the ground surface of 0.6 m. The soil bearing capacity of SM soil below ground water level decreases 70 to 75 percent (average values from testing results) comparing to that of dry soil. Moreover, bearing capacity of SM soil above ground water table up to 0.6 m decreases 25 to 30 percent (average values from testing results) comparing to that of dry soil at the same depth. The SM soil layer was lower bearing capacity due to higher ground water table. Therefore, bearing capacity determination of silty sandy soil layer should be also considered the effect of ground water table.Keywords
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References
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